Does Polkadot have unlimited supply?

Could you please clarify for me whether Polkadot has an unlimited supply of tokens? I've been hearing different opinions about this, and I'm trying to get a definitive answer. As a professional in the field of cryptocurrency and finance, I'm sure you have a deep understanding of Polkadot's economics and supply mechanics. If Polkadot indeed has an unlimited supply, how does that affect its long-term value and scarcity? Conversely, if the supply is limited, how does that contribute to its potential growth and sustainability? I'm keen to understand the implications of this on investors' decisions and the overall health of the Polkadot ecosystem.